Is there anyway to specify that image format of a texture?

In normal webgl we can create a luminance texture like this:

gl.texImage2D(
  gl.TEXTURE_2D,
  0, // level
  gl.LUMINANCE, // internal format
  numPoints, // width
  1, // height
  0, // border
  gl.LUMINANCE, // format
  gl.UNSIGNED_BYTE, // type
  null
);

But the only options I see for texture uniforms is interpolation and wrap:

type TextureOptions = {
  interpolation: Interpolation,
  wrap: [WrapMode, WrapMode] | WrapMode,
};

Is there somewhere else to specify this?